Teatro Olimpico (Vicenza, 16th century)

The first indoor theatre in modern history to be constructed according to the theatre-building codes of Antiquity was inaugurated in 1585.

Gothic cathedral (Clermont-Ferrand, 15th century)

The cathedral named after the Assumption of Mary into Heaven is one of the gems of French Gothic architecture.

Polymerisation of ethene

Polymerised ethylene is known as polyethylene, a type of plastic.

Melting and freezing

During freezing hydrogen bonds are formed between water molecules resulting in a crystal structure.

Reaction of hydrogen with oxygen

Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.

Neptune

Neptune is the outermost planet of the Solar System, the smallest of the giant planets

Large white butterfly

The large white butterfly is a common species of butterflies, through which we demonstrate the anatomy of butterflies.

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

DC motor

DC motors consist of a permanent magnet and a coil within the magnet, with electric current flowing in it.

Thyroid gland

An important endocrine gland producing hormones that affect metabolism and the calcium balance of the body.

Sphere

A sphere is the set of points which are all within the same distance from a given point in space.

Cylindrical solids

This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.

Cube

This animation demonstrates the components (vertices, edges, diagonals and faces) of the cube, one of the Platonic solids.

Cube of cubes

An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.

Dissolution of hydrogen chloride (HCl) in water

The solution of hydrogen chloride in water is called hydrochloric acid.

Robots

An entertaining game about different views of spatial objects.

Cuboid

A cuboid is a polyhedron with six rectangular faces.

Addition

Addition is a reaction in which the molecules of two or more substances unite without the formation of a by-product.

Producing ammonia from nitrogen gas and hydrogen gas

Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.

Reaction of ammonia with hydrogen chloride

Ammonium chloride is the result of the reaction of ammonia and hydrogen chloride

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